Everyone was getting excited this week that Apple seemed to be growing its Music service by around 2m paying subscribers a month. That figure was extrapolated from comments by Apple CEO Tim Cook, taken from a preview of a Bloomberg TV interview on the David Rubenstein Show, which will go out in June. Cook revealed that Apple Music’s streaming service now has more than 50m users – either paid or on free trials. He had previously said that Apple has 8m trials at any point. That puts the paying number on 42m just one month after Apple said on an earnings call that it had 40m users – hence the extrapolated run rate. Apple Insider felt this was closer to…